Paul,

Have a look at the following extract from the Binkley 2.60 docs, and tell
me if you had your Viper set up correctly, according to its fax class. 
Unless it's a Class 2.0 (which it isn't), your bit rate was probably set
too high (or did you use the FaxBaud comment?).

====================================================================
Class 1

With this class of modem most of the work is done by the software.
Many modems in the class are not capable of adaptive answering (see
below) and so they are *NOT* suitable for use with BinkleyTerm. A
few modems in this class do have adaptive answering capability so
consult your modem documentation.

Class 1 modems receive data in "Direct bit order".

Class 1 modems when in fax mode operate at a maximum bit rate of 19200


Class 2

Like class 1, Class 2 modems can only operate for FAX purposes at a
maximum bit rate of 19200.

Class 2 modems are capable of adaptive answering (see below) so
they can be used with BinkleyTerm for automatic FAX reception

Class 2 modems receive fax in Reverse bit order.


Class 2.0

The official standard, called Class 2.0 to differentiate it from
class 2 above, is NOT the same as Class 2. Such modems have several
added features, the most important, for fax work, being that they
are capable of receiving fax when the DCE rate (modem to computer
speed) is set or locked at speeds above 19200 bits per second.

Class 2.0 modems receive data in direct bit order.


AT+FCLASS=?

If you send the above command to your modem whilst in Terminal mode

You may well be able to find out which classes your modem can support.

    A response of     0     indicates data mode
    A response of     1     indicates class 1 fax capability
    A response of     2     indicates class 2 fax capability
    A response of     2.0   indicates class 2.0 fax capability
    Error                   indicates  no fax capability.

Adaptive Answer

"Adaptive Answering", or "call selection" as USR chooses to call
it, is a feature of Class 2 and Class 2.0 modems and  is the modem
feature that enables the MODEM to decide if an incoming call is Fax
or Data and send out an appropriate response code (such as FAX or
+FCO) for a fax call.

In general, Class 1 modems need to be set to receive fax *OR* to
receive Data before a call is received. If set to Data they will
not receive Fax, and vice versa. That is they do not adaptively
answer the call but there are a few Class 1 modems, such as the
Supra 144LC with the 1.80 revision ROMs which do support adaptive
answering.

Bit Rate

As noted above, Class 1 and Class 2 modems can only operate for FAX
reception at a computer to modem rate not exceeding 19200 bps.

This is a big snag with modern high speed modems where the bit
rate may normally be locked at either 57600 or 112500.

Unless you can accept locking the bit rate for all transmissions
to 19200 it becomes necessary with these modem classes to leave the
fossil unlocked and to control the bit rate by other means.

Do not lock the Fossil but instead use the 'Faxbaud' statement to
lock at 19200 for faxes and other controls (such as 'LockBaud/Arq')
for data.

If the Fossil is not locked then BinkleyTerm will set the bit rate
to 19200 on a FAX connection unless you set `FaxBaud X', in which
case your specified 'baud' rate will be used.

Class 2.0 modems can operate with a fossil locked at the speeds
used for normal BinkleyTerm operations
=======================================================================

Regards, Bill

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